666

Ok this is efficient.

Highly satisfying and clever

instead of making counter variable you can return used.length and remove the counter

Good work!!

that's awesome.

Very good code

Definitely clever but readability makes me question whether this is method really qualifies as "Best Practices" for this kind of problem.

I spent time figuring out what the regexp does, but I was amazed by the solution.

One line's not always important. Every time you ask for the array's length, a function is called to provide it at runtime. If you break this up into multiple lines you can store the length as a const to be efficient and make it more readable at the same time.

I like the solution, but it adds complexity to understanding. Impressive, but good?

sure they can

they cant fire me if they cant read my code

👍👍👍